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Aplicas productos notables.
(a + b)² = a² + 2ab + b²
(senx + cosx)² = 1 + 2senxcosx
sen²x + 2senxcosx + cos²x = 1 + 2senx cosx
(sen²x + cos²x) + 2senxcosx = 1 + 2senxcosx Pero sen²x + cos²x = 1 por identidad fundamental
1 + 2senxcosx = 1 +2senxcosx